RecruitingDrug trialA Trial to Evaluate Safety, Tolerability, Pharmacokinetics and Preliminary Efficacy of TST001 in Advanced or Metastatic Solid TumorsThis is an open-label, multi-center, Phase I trial of TST001. Subjects with locally advanced or metastatic solid tumors will be enrolled. The study will consist of two parts: Part A is dose escalation and dose expansion phase for mono-therapy, and Part B is dose escalation and dose expansion phase for combination therapy in gastric, gastroesophageal junction(G/GEJ) and biliary tract cancer, etc.